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Inomata, Takeshi Ortiz, Raúl Arroyo, Bárbara and Robinson, Eugenia J. Chronological Revision of Preclassic Kaminaljuyú, Guatemala: Implications for Social Processes in the Southern Maya Area.
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Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.
Green plants absorb the carbon dioxide, so the population of carbon-14 molecules is continually replenished until the plant dies.
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The same amount of carbon-14 is present in animals, which get their carbon by eating plants or other animals.
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